CVE-2017-2636

kernel: Race condition access to n_hdlc.tbuf causes double free in n_hdlc_release()

Severity Score

7.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Race condition in drivers/tty/n_hdlc.c in the Linux kernel through 4.10.1 allows local users to gain privileges or cause a denial of service (double free) by setting the HDLC line discipline.

Condición de carrera en drivers/tty/n_hdlc.c en el kernel de Linux hasta la versión 4.10.1 permite a usuarios locales obtener privilegios o provocar una denegación de servicio (liberación doble) ajustando la línea de disciplina HDLC.

A race condition flaw was found in the N_HLDC Linux kernel driver when accessing n_hdlc.tbuf list that can lead to double free. A local, unprivileged user able to set the HDLC line discipline on the tty device could use this flaw to increase their privileges on the system.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-12-01 CVE Reserved
2017-03-07 CVE Published
2017-03-18 First Exploit
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-415: Double Free

CAPEC

References (19)

URL	Tag	Source
http://www.securityfocus.com/bid/96732	Third Party Advisory
http://www.securitytracker.com/id/1037963	Third Party Advisory
https://a13xp0p0v.github.io/2017/03/24/CVE-2017-2636.html	Third Party Advisory

URL	Date	SRC
https://github.com/alexzorin/cve-2017-2636-el	2017-03-18

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2017/03/07/6	2023-02-24

URL	Date	SRC
http://www.debian.org/security/2017/dsa-3804	2023-02-24
https://access.redhat.com/errata/RHSA-2017:0892	2023-02-24
https://access.redhat.com/errata/RHSA-2017:0931	2023-02-24
https://access.redhat.com/errata/RHSA-2017:0932	2023-02-24
https://access.redhat.com/errata/RHSA-2017:0933	2023-02-24
https://access.redhat.com/errata/RHSA-2017:0986	2023-02-24
https://access.redhat.com/errata/RHSA-2017:1125	2023-02-24
https://access.redhat.com/errata/RHSA-2017:1126	2023-02-24
https://access.redhat.com/errata/RHSA-2017:1232	2023-02-24
https://access.redhat.com/errata/RHSA-2017:1233	2023-02-24
https://access.redhat.com/errata/RHSA-2017:1488	2023-02-24
https://bugzilla.redhat.com/show_bug.cgi?id=1428319	2017-06-19
https://access.redhat.com/security/cve/CVE-2017-2636	2017-06-19
https://access.redhat.com/security/vulnerabilities/CVE-2017-2636	2017-06-19

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 2.6.31 < 3.2.87 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 3.2.87"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.3 < 3.10.106 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.3 < 3.10.106"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.11 < 3.12.72 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.11 < 3.12.72"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.13 < 3.16.42 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.13 < 3.16.42"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.17 < 3.18.49 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.17 < 3.18.49"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.19 < 4.1.49 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.19 < 4.1.49"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.2 < 4.4.54 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 4.4.54"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.5 < 4.9.15 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.5 < 4.9.15"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.10 < 4.10.3 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.10 < 4.10.3"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected